Scale for rotary encoder, method of injection-molding same, and rotary encoder using same
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United States of America Patent
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Dec 29, 2015
Grant Date -
Apr 3, 2014
app pub date -
Jun 7, 2012
filing date -
Jun 9, 2011
priority date (Note) -
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Abstract
In a radial optical path type rotary encoder, in order to be able to reduce deterioration of resolution and variation among products due to burrs during molding and/or rounding of a die, a scale for a rotary encoder is provided with a scale body which is formed substantially in a cylindrical shape, the scale body having a side surface portion in which a light transmitting portion through which light passes and a light blocking portion by which light with a predetermined width in a circumferential direction is blocked are formed alternately in the circumferential direction, wherein the side surface on a light-incident side of the light blocking portion is formed outside a light transmittable region having an outer edge defined by a light beam tangent to the side surface of the light blocking portion amidst the light passing through the light transmitting portion, in a lateral cross-section view.
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